CN104779994A - Ethernet passive optical network protection method and device - Google Patents
Ethernet passive optical network protection method and device Download PDFInfo
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- CN104779994A CN104779994A CN201410012471.4A CN201410012471A CN104779994A CN 104779994 A CN104779994 A CN 104779994A CN 201410012471 A CN201410012471 A CN 201410012471A CN 104779994 A CN104779994 A CN 104779994A
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Abstract
The invention is applicable to the technical field of access network, and provides an Ethernet passive optical network protection method comprising the following steps: detecting the optical power of an optical signal in a first interface, wherein the first interface is an interface which is connected with an optical line terminal OLT currently; switching from the first interface to a second interface and establishing connection with the OLT through the second interface if the optical power of the optical signal falls outside a preset range; and communicating with the OLT through the second interface. According to the invention, an ONU consists of the first interface and the second interface and is connected with the OLT through the first interface to perform uplink and downlink optical signal communication, the optical power of the optical signal in the first interface is detected, and if the optical power of the optical signal falls outside the preset range, the ONU is switched from the first interface to the second interface, and the ONU and the OLT perform uplink and downlink optical signal communication through the second interface. Thus, the reliability of communication under abnormal optical power of an EPON network is improved.
Description
Technical field
The invention belongs to technical field of access networks, particularly relate to a kind of guard method and device of ethernet passive optical network.
Background technology
Ethernet passive optical network (Ethernet Passive Optical Network, EPON) be a kind of intelligent acess technology, adopt point-to-multipoint structure, as shown in Figure 1, equipment optical line terminal (the OpticalLine Terminal of local side, OLT) with equipment optical network unit (the Optical Network Unit of several user sides, ONU) Fiber connection is adopted between, for ONU provides service, each ONU there is an interface be connected with OLT, this interface is called PON mouth, can connect several domestic user terminal under each ONU.
The point-to-multipoint tactic pattern of EPON can adapt to the circuit of layout complexity, makes it be applicable to being applied in distribution network automated communication system, is responsible for the process of information, sends and return.At present, when EPON technology is applied in distribution network automated communication system, if there is the PON mouth in ONU, unprotect list chain structure as shown in Figure 1, occurs that when communicating with OLT luminous power is too high or too low, in the process that system starts, ONU can be caused cannot to register on OLT; In the process of system cloud gray model, the upstream data that the downlink data that ONU None-identified OLT can be caused to send and OLT None-identified ONU send, thus cause the communication disruption of all domestic user terminal of this below ONU, communication reliability is poor.
Summary of the invention
The object of the present invention is to provide a kind of guard method of ethernet passive optical network, be intended to solve the problem that when PON mouth in existing EPON network occurs that luminous power is abnormal, communication reliability is poor.
The present invention is achieved in that a kind of guard method of ethernet passive optical network, comprising:
Detect the luminous power of light signal in first interface, described first interface is the current interface be connected with optical line terminal OLT;
If the luminous power of described light signal drops on outside preset range, switch to the second interface from described first interface, be connected with described OLT by described second interface;
Communicated with described OLT by described second interface.
Another object of the present invention is to the protective device that a kind of ethernet passive optical network is provided, comprising:
Detecting unit, detect the luminous power of light signal in first interface, described first interface is the current interface be connected with optical line terminal OLT;
Switch unit, if drop on outside preset range for the luminous power of described light signal, switches to the second interface from described first interface, is connected with described OLT by described second interface;
Communication unit, for communicating with described OLT by described second interface.
In the present invention, first interface and the second interface is comprised in ONU, be connected with OLT by first interface, carry out the optical signal communications of uplink and downlink, detect the luminous power of light signal in first interface, if the luminous power of light signal drops on outside preset range, switch to the second interface from first interface, carried out the optical signal communications of uplink and downlink by the second interface and OLT, improve the reliability of communication when EPON network occurs that luminous power is abnormal.
Accompanying drawing explanation
Fig. 1 is the EPON structural topology figure that prior art provides;
Fig. 2 is the EPON structural topology figure that the embodiment of the present invention provides;
Fig. 3 is the realization flow figure of the guard method of the ethernet passive optical network that the embodiment of the present invention provides;
Fig. 4 is the specific implementation flow chart repairing luminous power exception in the guard method of the ethernet passive optical network that the embodiment of the present invention provides;
Fig. 5 is the structured flowchart of the protective device of the ethernet passive optical network that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In embodiments of the present invention, first interface and the second interface is comprised in ONU, be connected with OLT by first interface, carry out the optical signal communications of uplink and downlink, detect the luminous power of light signal in first interface, if the luminous power of light signal drops on outside preset range, switch to the second interface from first interface, carried out the optical signal communications of uplink and downlink by the second interface and OLT, improve the reliability of communication when EPON network occurs that luminous power is abnormal.
Fig. 2 shows the EPON structural topology figure that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present embodiment.
Reference Fig. 2, OLT21 are by Fiber connection on two PON mouths of ONU22, and connect several domestic user terminal (not shown) under ONU22 herein, OLT21 and ONU22 carries out two-way communication.OLT21 converts the signal of telecommunication of front end switch to light signal, realizes the functions such as the control to ONU22, management and range finding; The broadcast data that ONU22 selects reception OLT to send, the range finding of response OLT and power control etc. are ordered, are carried out buffer memory and in the time window of OLT21 distribution, send the data of domestic user terminal to OLT21 to the data of its lower domestic user terminal.With the communication process of OLT21, a PON mouth of ONU22 is in running order, another PON mouth is in stand-by state, and the 26S Proteasome Structure and Function of two PON mouths is identical, when in running order PON mouth, the luminous power of light signal occurs abnormal, start the PON mouth under stand-by state, switch to operating state, communicate with OLT21, meanwhile, the PON mouth broken down can be repaired, and can not communication disruption be caused.
Fig. 3 shows the realization flow of the guard method of the ethernet passive optical network that the embodiment of the present invention provides, and details are as follows:
In step S301, detect the luminous power of light signal in first interface, described first interface is the current interface be connected with optical line terminal OLT.
In embodiments of the present invention, first interface is one of them PON mouth of ONU, is connected with OLT, in running order.Uplink and downlink light signal between OLT and ONU all needs through first interface.
As one embodiment of the present of invention, step S301 is specially: the luminous power detecting the uplink optical signal in first interface, and described uplink optical signal is sent to OLT by described first interface; And the luminous power of downlink optical signal in detection first interface, described downlink optical signal is sent to described first interface by described OLT.
Up direction is ONU to OLT direction, and down direction is OLT to ONU direction.In embodiments of the present invention, intercept up direction 1310nm light signal and down direction 1490nm light signal simultaneously, obtain its luminous power.
In step s 302, if the luminous power of described light signal drops on outside preset range, switch to the second interface from described first interface, be connected with described OLT by described second interface.
In embodiments of the present invention, the second interface is one of them PON mouth of ONU, and 26S Proteasome Structure and Function is identical with first interface, is in stand-by state.When the luminous power of light signal in first interface occurs abnormal, switch to the second interface from first interface, make the second interface in running order.Luminous power is abnormal refers to that luminous power is too high or too low.
As one embodiment of the present of invention, step S302 is specially: if the luminous power of described uplink optical signal drops on outside the first preset range, switch to the second interface from described first interface; If and/or the luminous power of described downlink optical signal drops on outside the second preset range, switch to described second interface from described first interface.
If uplink optical signal or downlink optical signal emergent power are extremely, switch to the second interface from first interface; If uplink optical signal and the equal emergent power of downlink optical signal are extremely, also the second interface must be switched to from first interface.
Because up direction is different with recipient with the transmit leg of down direction, it judges that the preset range of luminous power exception is also different.Reference light communication specification standard, for up direction, the first preset range can be selected at 0 ~ 4dBm; For down direction, the second preset range can be selected at-26dBm ~-3dBm.When detecting that the luminous power of uplink optical signal drops on outside 0 ~ 4dBm, or when detecting that the luminous power of downlink optical signal drops on outside-26dBm ~-3dBm, or the luminous power of the luminous power of uplink optical signal and downlink optical signal drops on outside the preset range of its correspondence respectively, all can be judged to be that luminous power occurs abnormal, ONU switches to the second interface from first interface.
If be in running the situation occurring luminous power exception in system, keep continuously uninterrupted to enable the ongoing communication service of ONU and OLT, communication service information in described first interface is synchronized to described second interface, and communication service information can refer to ongoing type of service, business progress and the information such as data cached.As, just broadcast at displaying video, then the video data synchronization of the playing progress rate of video broadcasting in first interface and buffer memory to the second interface, second interface can continue displaying video broadcast according to these communication service informations on the basis of original playing progress rate, makes the interruption of the imperceptible business of user.
In step S303, communicated with described OLT by described second interface.
ONU completes registration in the olt by the second interface after switching to the second interface from first interface, traveling optical signal communication etc. of going forward side by side.
Although ONU can eliminate the fault of luminous power exception after switching to the second interface from first interface, in order to remind monitor staff, if the luminous power of described light signal drops on outside described preset range, send alarm prompt.Alarm prompt includes but not limited to start jingle bell, indicator light flicker and eject prompting frame etc.
Above-mentioned when judging that luminous power is whether abnormal, if the luminous power of described downlink optical signal drops on outside described second preset range, namely represent that luminous power is improper by the utilizing emitted light power of OLT and cause extremely.As one embodiment of the present of invention, while startup second interface carries out communicating, the problem of first interface luminous power exception can be repaired, as shown in Figure 4, specific as follows:
In S401, store the op-tical power information of the described downlink optical signal in described first interface.
In S402, described op-tical power information is sent to described OLT, to make described OLT according to the utilizing emitted light power of described op-tical power information adjustment self.
In embodiments of the present invention, ONU is stored in the op-tical power information of the downlink optical signal that first interface detects, op-tical power information can be the value of the luminous power that ONU detects, also can be characterize the too high or too low mark of this luminous power, and at up direction, this op-tical power information being fed back to OLT, OLT adjusts self utilizing emitted light power after receiving this op-tical power information.If luminous power is too high, then OLT reduces the utilizing emitted light power of self; If luminous power is too low, then OLT improves the utilizing emitted light power of self.After this type of fault restoration, ONU can switch to first interface and communicates, or continuation use second interface communicates.
In embodiments of the present invention, first interface and the second interface is comprised in ONU, be connected with OLT by first interface, carry out the optical signal communications of uplink and downlink, detect the luminous power of light signal in first interface, if the luminous power of light signal drops on outside preset range, switch to the second interface from first interface, carried out the optical signal communications of uplink and downlink by the second interface and OLT, improve the reliability of communication when EPON network occurs that luminous power is abnormal.
Fig. 5 shows the structured flowchart of the protective device of the ethernet passive optical network that the embodiment of the present invention provides, and this device can be arranged in the ONU equipment of EPON network, for performing the guard method of the ethernet passive optical network that Fig. 3 and Fig. 4 of the present invention describes.For convenience of explanation, illustrate only part related to the present embodiment.
With reference to Fig. 5, this device comprises:
Detecting unit 51, detect the luminous power of light signal in first interface, first interface is the current interface be connected with OLT.
Switch unit 52, if the luminous power of light signal drops on outside preset range, is switched to the second interface from first interface, is connected by the second interface with OLT.
Communication unit 53, is communicated with OLT by the second interface.
Alternatively, detecting unit 51 comprises:
Up detection sub-unit, detect the luminous power of the uplink optical signal in first interface, uplink optical signal is sent to OLT by first interface.And
Descending detection sub-unit, detect the luminous power of the downlink optical signal in first interface, downlink optical signal is sent to first interface by OLT.
Switch unit 52 comprises:
Up switching subelement, if the luminous power of uplink optical signal drops on outside the first preset range, switches to the second interface from first interface.And/or
Descending switching subelement, if the luminous power of downlink optical signal drops on outside the second preset range, switches to the second interface from first interface.
Alternatively, if the luminous power of downlink optical signal drops on outside the second preset range, this device also comprises:
Memory cell, stores the op-tical power information of the downlink optical signal in first interface.
Transmitting element, is sent to OLT by op-tical power information, to make OLT according to the utilizing emitted light power of op-tical power information adjustment self.
Alternatively, this device also comprises:
Lock unit, is synchronized to the second interface by the communication service information in first interface.
Alternatively, this device also comprises:
Alarm Unit, if the luminous power of light signal drops on outside preset range, sends alarm prompt.
In embodiments of the present invention, first interface and the second interface is comprised in ONU, be connected with OLT by first interface, carry out the optical signal communications of uplink and downlink, detect the luminous power of light signal in first interface, if the luminous power of light signal drops on outside preset range, switch to the second interface from first interface, carried out the optical signal communications of uplink and downlink by the second interface and OLT, improve the reliability of communication when EPON network occurs that luminous power is abnormal.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a guard method for ethernet passive optical network, is characterized in that, described method comprises:
Detect the luminous power of light signal in first interface, described first interface is the current interface be connected with optical line terminal OLT;
If the luminous power of described light signal drops on outside preset range, switch to the second interface from described first interface, be connected with described OLT by described second interface;
Communicated with described OLT by described second interface.
2. the method for claim 1, is characterized in that, in described detection first interface, the luminous power of light signal comprises:
Detect the luminous power of the uplink optical signal in first interface, described uplink optical signal is sent to OLT by described first interface; And
Detect the luminous power of the downlink optical signal in first interface, described downlink optical signal is sent to described first interface by described OLT;
If the luminous power of described light signal drops on outside preset range, switch to the second interface from described first interface and comprise:
If the luminous power of described uplink optical signal drops on outside the first preset range, switch to the second interface from described first interface; And/or
If the luminous power of described downlink optical signal drops on outside the second preset range, switch to described second interface from described first interface.
3. method as claimed in claim 2, it is characterized in that, if the luminous power of described downlink optical signal drops on outside described second preset range, described method also comprises:
Store the op-tical power information of the described downlink optical signal in described first interface;
Described op-tical power information is sent to described OLT, to make described OLT according to the utilizing emitted light power of described op-tical power information adjustment self.
4. the method for claim 1, it is characterized in that, if drop on outside preset range, after described first interface switches to the second interface in the luminous power of described light signal, described to be communicated with described OLT by described second interface before, described method also comprises:
Communication service information in described first interface is synchronized to described second interface.
5. the method as described in any one of Claims 1 to 4, is characterized in that, described method also comprises:
If the luminous power of described light signal drops on outside described preset range, send alarm prompt.
6. a protective device for ethernet passive optical network, is characterized in that, described device comprises:
Detecting unit, detect the luminous power of light signal in first interface, described first interface is the current interface be connected with optical line terminal OLT;
Switch unit, if drop on outside preset range for the luminous power of described light signal, switches to the second interface from described first interface, is connected with described OLT by described second interface;
Communication unit, for communicating with described OLT by described second interface.
7. device as claimed in claim 6, it is characterized in that, described detecting unit comprises:
Up detection sub-unit, for detecting the luminous power of the uplink optical signal in first interface, described uplink optical signal is sent to OLT by described first interface; And
Descending detection sub-unit, for detecting the luminous power of the downlink optical signal in first interface, described downlink optical signal is sent to described first interface by described OLT;
Described switch unit comprises:
Up switching subelement, if drop on outside the first preset range for the luminous power of described uplink optical signal, switches to the second interface from described first interface; And/or
Descending switching subelement, if drop on outside the second preset range for the luminous power of described downlink optical signal, switches to described second interface from described first interface.
8. device as claimed in claim 7, it is characterized in that, if the luminous power of described downlink optical signal drops on outside described second preset range, described device also comprises:
Memory cell, for storing the op-tical power information of the described downlink optical signal in described first interface;
Transmitting element, for described op-tical power information is sent to described OLT, to make described OLT according to the utilizing emitted light power of described op-tical power information adjustment self.
9. device as claimed in claim 6, it is characterized in that, described device also comprises:
Lock unit, for being synchronized to described second interface by the communication service information in described first interface.
10. the device as described in any one of claim 6 ~ 9, is characterized in that, described device also comprises:
Alarm Unit, if dropped on outside described preset range for the luminous power of described light signal, sends alarm prompt.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106550290A (en) * | 2015-09-21 | 2017-03-29 | 中兴通讯股份有限公司 | The method of EPON power equalization, device, terminal, unit and system |
| WO2017113814A1 (en) * | 2015-12-29 | 2017-07-06 | 中兴通讯股份有限公司 | Method and apparatus for realizing optical network unit activation |
| CN111344962A (en) * | 2017-11-22 | 2020-06-26 | 华为技术有限公司 | Network interface switching method of optical network unit and optical network unit |
| CN111970049A (en) * | 2019-05-20 | 2020-11-20 | 华为技术有限公司 | Optical power detection method and device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101060369A (en) * | 2006-04-17 | 2007-10-24 | 华为技术有限公司 | A method and system for solving the errors under the PON PLOAM system |
| CN101159506A (en) * | 2007-10-26 | 2008-04-09 | 华为技术有限公司 | PON communication channel balancing method, device and system |
| CN101247182A (en) * | 2008-03-07 | 2008-08-20 | 中兴通讯股份有限公司 | Power control method of passive optical network |
| CN102202244A (en) * | 2010-03-23 | 2011-09-28 | 中兴通讯股份有限公司 | Method and device for improving protective performance of passive optical network |
| CN102204219A (en) * | 2011-04-19 | 2011-09-28 | 华为技术有限公司 | Method, apparatus and system for switching and playing a video |
| CN102412896A (en) * | 2011-11-28 | 2012-04-11 | 武汉光迅科技股份有限公司 | Optical line protection system for realizing single-end monitoring |
| CN202663400U (en) * | 2012-06-04 | 2013-01-09 | 广东东研网络科技股份有限公司 | Improved light switching device |
| CN103378918A (en) * | 2012-04-19 | 2013-10-30 | 中兴通讯股份有限公司 | Method for adjusting channel and apparatus |
-
2014
- 2014-01-10 CN CN201410012471.4A patent/CN104779994B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101060369A (en) * | 2006-04-17 | 2007-10-24 | 华为技术有限公司 | A method and system for solving the errors under the PON PLOAM system |
| CN101159506A (en) * | 2007-10-26 | 2008-04-09 | 华为技术有限公司 | PON communication channel balancing method, device and system |
| CN101247182A (en) * | 2008-03-07 | 2008-08-20 | 中兴通讯股份有限公司 | Power control method of passive optical network |
| CN102202244A (en) * | 2010-03-23 | 2011-09-28 | 中兴通讯股份有限公司 | Method and device for improving protective performance of passive optical network |
| CN102204219A (en) * | 2011-04-19 | 2011-09-28 | 华为技术有限公司 | Method, apparatus and system for switching and playing a video |
| CN102412896A (en) * | 2011-11-28 | 2012-04-11 | 武汉光迅科技股份有限公司 | Optical line protection system for realizing single-end monitoring |
| CN103378918A (en) * | 2012-04-19 | 2013-10-30 | 中兴通讯股份有限公司 | Method for adjusting channel and apparatus |
| CN202663400U (en) * | 2012-06-04 | 2013-01-09 | 广东东研网络科技股份有限公司 | Improved light switching device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106550290A (en) * | 2015-09-21 | 2017-03-29 | 中兴通讯股份有限公司 | The method of EPON power equalization, device, terminal, unit and system |
| WO2017113814A1 (en) * | 2015-12-29 | 2017-07-06 | 中兴通讯股份有限公司 | Method and apparatus for realizing optical network unit activation |
| US10547921B2 (en) | 2015-12-29 | 2020-01-28 | Zte Corporation | Method and apparatus for realizing optical network unit activation |
| CN111344962A (en) * | 2017-11-22 | 2020-06-26 | 华为技术有限公司 | Network interface switching method of optical network unit and optical network unit |
| CN111344962B (en) * | 2017-11-22 | 2022-01-11 | 华为技术有限公司 | Network interface switching method of optical network unit and optical network unit |
| CN111970049A (en) * | 2019-05-20 | 2020-11-20 | 华为技术有限公司 | Optical power detection method and device |
| CN111970049B (en) * | 2019-05-20 | 2022-05-13 | 华为技术有限公司 | Optical power detection method and device |
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| CN104779994B (en) | 2018-11-23 |
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